Bump react-scripts from 3.3.1 to 3.4.0 (#773)

Bumps [react-scripts](https://github.com/facebook/create-react-app/tree/HEAD/packages/react-scripts) from 3.3.1 to 3.4.0.
- [Release notes](https://github.com/facebook/create-react-app/releases)
- [Changelog](https://github.com/facebook/create-react-app/blob/master/CHANGELOG.md)
- [Commits](https://github.com/facebook/create-react-app/commits/react-scripts@3.4.0/packages/react-scripts)

Signed-off-by: dependabot-preview[bot] <support@dependabot.com>

package.json

@@ -11,7 +11,7 @@
     "nanoid": "2.1.11",
     "react": "16.12.0",
     "react-dom": "16.12.0",
-    "react-scripts": "3.3.1",
+    "react-scripts": "3.4.0",
     "roughjs": "4.0.4"
   },
   "description": "",